Type-writing machine.



W. H. WOODFORD.

TYPE WRITING MACHINE.

APPLICATION FILM 1113.18, 1909.

'Patented June 1, 1909.

By his/Idorw pl i'inesgs;

yd QM UNITED srrrirns PATENT easier;

WATSON H. WOODFORD, OF HARTFORQ'CONNECTICUT, ASSIGNOR TO UNDERWOOD TYI'T WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE Specification of Letters Patent.

Patented June 1, 1909.

Application filed February 18, 1909. Serial No. 478,675.

y a specification.

, This inventionrelates to means for securing blank spaces betweent of successive bills on an entrysheet in the op-' oration of condensed billing, and is in the nature of an improvement upon the mechanwith the wheel.

Broughton. No. 436,534, filed June 4, 1908. In said application, a crank is mounted loosely upon the platen axle, and a pawl is pivoted upon the crank to engage a notched wheel fixed to the platen; a latch or trip normally holding the pawl out of engagement Amovement of the crank throws the pawl into engagement with the wheel, such engagementbeing mechanically maintained during the rotation of the platen by the crank and until the l'atter is swung back to normal position. -A spring then throws the pawl out of engagement with the wheel. In said application, the crank-operating pawl is caused to skip one or more notches or teeth of the wheel during the initial stroke of the crank. The engagement of the dog with said wheel is however maintained during the entire return movement of the crank to normal position, so that the forward rotation of the platen effected by said wheel is greater than the backward rotation thereof. Thus the platen is caused to turn backwardly a relatively short distance. to receive a bill, and then forwardly a relatively long distance to bring the bill to printing position.

The object of the present invention is to simplify and improve the construction and operation of the latch or trip mechanism, which causes the dog or pawl to skip the teeth of the notched wheel to effect the spacing between the sucessive bills on the carbon sheet.

In the accompanying drawings, Figure 1 is a'plan of a portion of the platen frame and platen of an Underwood front strike writin wardly to an unlimited extent.

mounted. Fig. 4 is an enlarged sectional elevation of the components of the'latch mechanism. Fig. 5 is a view of thespring to re lease the pawl from'the toothed wheel. Fig. 6 is a diagram showing the spring causing the pin on the awl to enter a recess inthe disk. Fig.7 is a i'agram showing the main lever or crank moved a little forwardly from normal position. Fig. 8 isan end elevation showing carbon entries the pin engaging an annular rim in the disk, and the pawl in engagement with the notched wheel, which is being turned by'thecrank. Fig. 9 is a sectional view of the devices seen ism disclosed in the application of L. D.

at Fig. 8. Fig. 10 is a view like Fig. 7but showing the parts in normal ositions. Fig. 11 is a perspective view of t e pa'wll Figs.- 12 to 14 show diagrammatically the escape of the pawl-pin from the latch at the beginning of the first stroke of the crank. 15 showsthe position of the parts at the end of the return stroke of the crank.

The usual platen 1 of an Underwood t writing mac ine is rotatably mounte by means of an axle 2 in the ends 3- of the platen frame, the'end of the axle projecting through the end of the platen frame end and having finger wheels 4 thereon, b means of which the platen may be rotated orwardly or backis also provided with the usual toothed line The platen.

space wheel 5, whichis engaged by a yielding detent 6 to hold the platen steady when writing. The line-space wheel. is advanced intermittently by means of a pawl 7 and a lever 8.

Upon the end of the platen axle 2 is fixed'a hub 9 of awheel 1t) having teeth 11 corresponding'in number to the teeth of the linespace wheel 5. The wheel 10 is' rotated by means of a pawl or dog 12 pivoted at 13 upon a crank 14 having a finger piece 15. The tooth 16 of the pawl is normally disengaged from the wheel 10, as atFig. 10, to permit independeiit rotation of said wheel and platen.

A in 17 projecting from the pawl 12 nor-- disk 20, which is connected by a tie-rod 21 to the platen frame end3. The pin 17 normally overlies a trip or latch 22 formedupon the side of a small disk 23, having a pivot or stem 24, whereby it is mounted in a circ ar recess 25 formed in the fixed disk 20. The small disk 23 has a pin 26 to engage a slot 27 ,in the fixed. disk 20,, to limit theoseillating movements of the small disk and hence of the latch or trip thereon. A spring 28 is coded about the stem 24 and engages the pin 26 to return the trip-disk to normal position.

Thethreaded stem 24 has a nut 29, in the form of 2. ca to inclose the pin 26 and spring 2? and toho d the latch or trip mechanism in p ace.

When the crank 14 is swung forwardly, the pin 17 rides down the forward inclined edge 30 of the recess 18, and presses down upon the trip 22, causing the tri disk 23 to oscillate, Figs. 13 and-14; and t e tooth 16 of the pawl iscaused to engage a tooth 11 of the wheel 10,.the pawl moving from the Fig. 7 to the Fig. 8 position. The pawl is held in engagement with the toothed wheel by means of the pin 17, which rides along the inner side of the annular rim 19. As soon as the pin 17 leaves the recess 18, the trip is returned to normal Fig. 10 position by means of the spring 28. The continued forward movementof the crank 14 swings the wheel 10 and platen 1 around until'the crank is arrested y an adjustable stop 32, Fig. 8. The crank 1s then swung backwardly together with the wheel 10'and the platen; but the backward movement of the wheel and platen is pro-. longed beyond the forward end of the recess 18, by .reason of the pin 17 riding along the under side of the trip 22, which forms a continuation of the annular rim 19. When the pip l7 approaches the end of said trip 22, a

ger 33 on a spring 34, which is secured upon the fixed disk 20, engages a notch or recess 35 formed in the )awl 12, and springs said pawl away from t e toothed wheel 10 and causes the pin 17 to reenter the recess 18. The return stroke of the crank is limited by a stop 36.

It wil be seen that the latch device is exceedingly compact, so that it takes up very little room circumferentially on the fixed an-- nular guard-member 19. It does not proect from the face of the fixed member, and

it is securely held in place by a small device- 29 placed out of the way upon the opposite side ,of said fixed member, while )revision is made for a latch-spring by simpl wireabout thelatch-shank 24 and connectmg it to the projection 26 which extends through the slot 27 and also serves as a stop to limit the oscillation of the latch-disk 23;-

the securing nut 29 being formed with a capportion 29 to inclose the spring pro- 3ect1ng pin 26. The parts are simple in construction and easily aoplied to the fixed member 19, and the iatter is easily and cheaply formed torreceivesaid. parts.

, Having thus described my invention, 1 claim:

1. In a typewriting machine havin a platen frame, a revoluble platen, a notc ed wheel to rotate therewith, and a fixed member upon the platen frame having a recess -a space being left y coiling aand provided with an annular rim into which said recess extends, the combination with a'crank mounted to turn about thcaxis of the notched wheel, of a pawl pivoted upon the crank-and provided with a pin to engage 7 the under side of therim to hold the pawl in engagement with the notched wheel, a spring upon the fixed member to engage the pawl to release it from the wheel and cause the pin to enter the recess in said rim at the termination of the return stroke of the crank, and an oscillating disk occupying said recess and formed with a latch to engage the pin ,tohold the pawl out of engagement with the wheel, and cause the pawl to skip a tooth of the wheel, the under surface of the latch forming a continuation of the under side of the rim, to .engage the pin and prolong the engagement of the pawl with the wheel, and a space being left between the end of the latch and the side of the recess in the rim, to permit the pawl pin to enter the recess.

2. In a typewriting machine having t platen frame, a revoluble platen, a notched wheel to rotate therewith, and a fixed member upon the platen frame having a recess and provided with an annular rim into which said recess extends, the combination with a crank mounted to turn about the axis of the notched wheel, of a pawl pivoted upon the crank and provided with a pin to engage the under side of the rim to hold the pawl in engagement with the notched wheel, a spring upon the fixed member to engage the pawl to release it from the wheel and cause the pin to enter the recess in said rim at the termination of the return stroke of the crank, an oscillating disk occupying said recess and formed with a latch to engage the pin to hold the pawl out of engagement with the'wheel, and cause the pawl to skip a tooth of the wheel, the under surface of the latch forming a continuation of the under side of the rim, to engage the pin and prolong the engagement of the awl with the wheel, and etween the end of the latch and the side of the recess in the rim, to permit the pawl pin to enter the recess, said disk having a screw-threaded stem whereby it is pivotally mounted in said fixed memher, a pin secured upon the disk to engage a slot in the fixed member to limit the oscillating movement of the latch, a spring coiled about the stem and engaging said pin to return the latch to normal position, and a nut in the form of cap to serve upmi said stem to hold the latch mechanism in place.

3. In a typewriting machine having a platen frame, a revoluble platen, a notched .Whed to rotate therewith, and a fixed member upon the platen frame having a recess and provided with an annular rim into which said recess extends, the combination with a crank mounted to turn about the axis of the notched wheel, of a pawl plvoted upon thecrank and provided with a pin to engage the underside of the rim to hold the pawl in engagement with the notched wheel, a springupon the fixed member toengage the pawl to release it from the wheel and cause the pin to enter the recess in said rim at the termination of the return stroke of the crank, an oscillatingrdisk occupying said recess and formed with a latch to engage the pin to hold the pawl out of engagement with the wheel, and cause the pawl to skip a tooth of the wheel, the under surface'of the latch forming a continuation of the under side'of' the rim, to engage the pin and prolong the engagement of the pawl with the wheel, and a space being left between the end of the latch and the side of the recess in the rim, to permit the pawl pin to enter the recess, said disk having a pivot-shank journaled in a hole in said fixed member and extending therethrough, and means engaging said shank upon the opposite side of said fixed member to. retain said disk in saidrecess.

4. In a typewritin machine having a platen frame, a revolu le platen, a notched wheel to rotate therewith, and a fixed member uponthe platen frame having a recess and provided with an annular rim into which saidrecess extends, the combination with a crank mounted to turn about the axis of the notched wheel, of a pawl pivoted upon the crank and provided witha pin to engage the under side of the rim to hold the pawl in engagement with the notched wheel, a spring u on the fixed member to engage the pawl to re ease it from the wheel and cause the pin to enter the recess in said rim at the termination of the return stroke of the crank, an oscillating disk occupying said recess and formed with a latch to engage the pin to hold the pawl out of engagement with the wheel, and cause the pawl to skip a tooth of the wheel, the under surface of the latch forming a continuation of the under side of the rim, to

engage the pin and prolong the engagement of the pawl with the wheel, and a space being left between the end of the latch and the side of the recess in the rim, to permit-the pawl pin to enter the recess, said disk having a pivot-shank ournaled 1n a hole in saidv fixed member and extending therethrough, means engaging said shank upon the opposite side of said fixed member to retain said' rdisk in said recess, and a s ring coiled around the projecting portion 0 said shank and en agmg a projection which extends from said isk through a slot in the fixed member and also sierfies-asa stop to limit the rotation of the 5. In a typewriting) machine having a platen frame, a revolu le platen, a notched wheel to rotate therewith, and a fixed member upon the platen frame having a recess and provided with an annular rim into which said recess extends, the combination with a crank mounted to turn about the axis of the l notched Wheel, of a pawl pivoted upon the gagement with the notched wheel, a spring upon the fixed member to engage the pawl to release it from the wheel and cause the pin to enter the recess in said rim at the termination, of the return stroke of the crank, an osformed with a latch to engage the pin to hold the pawl out of engagement with the wheel, and cause the pawl to skip a tooth ofthe a continuation of the under side of the rim, to engage the pin and prolong the engagement of the pawl with the wheel, anda space being left between the end of the latch and the side of the recess in the rim, to permit the pawl pin to enter the recess, said disk having a pivot-shank journaled in a hole in said fixed member and extending theretln'ough, means engaging said shank uponthe opposite side of said fixed member to retain said disk in said recess, and a spring coiled around the projecting portion of said shank and engaging a projection which extends from said disk through a slot in the fixed member and also serves as a stop to limit the rotation of the disk, said retaining means in the form of a nut threaded upon the tip of the shank and having a cap-portion to incloso. the spring and the pro jccting stop-pin.

- \Vitncsscs:

W. M. BYonKMAN,

l A'MAN l). Bnoucrrwn wheel, the under surface of the latch forming crank and provided with a in to engage the under side of the rim to ho d the pawl in en-.

cillating disk occupying said recess andv 

